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. 2015 Jun 1;5:10661. doi: 10.1038/srep10661

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The spectral heat flux as a function of the emitter and the PV cell thicknesses assuming an emitter temperature T_H = 1000 K and a gap distance g = 100 nm: (a) the spectral heat flux for a Ge emitter, (b) the spectral heat flux for a W emitter. By making the emitter and the PV cell thin, radiative energy transfer at wavelengths below the band gap is significantly suppressed.